@book { OptimierungvonImmobilienportfolios,
    title = "Optimierung von Immobilienportfolios",
    subtitle = "Der Einsatz quantitativer Analysemethoden",
    author = "Christiane {Büch}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832422448",
    url = "https://m.diplom.de/document/218064"
}